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TECHNOLOGY IN ACTION


AAOS BoneModels O


gle Models and Prototypes - with a strong reputation for applying its experience and know- how to medical device development projects - was privileged to become involved in the design and development of a system to demonstrate the key stages of the surgical procedure for contemporary total knee arthroplasty (or, in layman’s terms, total knee replacement).


DePuy Orthopaedic, a member of the Johnson & Johnson family of companies, develops and manufactures surgical instruments and is a market leader in evolving product development processes for surgical instruments.


Ogle Models and Prototypes has previously worked with DePuy in creating


two completely new surgical instruments for total knee arthroplasty, so they were a logical choice for this new project.


The task was to create a set of six bone models which would allow each step of a total knee arthroplasty to be demonstrated or practiced. In addition, the models would have to be sturdy enough to allow the use of real surgical instruments at each of the key stages of the surgical procedure. Finally, the models had to reflect the high standard and quality of other DePuy products.


Even with the expert knowledge of Ogle Models and Prototypes it was an unusual and demanding commission. It was apparent that further design input was required to develop the concept. Ogle models and Prototypes turned to Andrew Kelly at Skywide Design - a product design studio, to kick start the design process and to deliver the necessary 3d CAD models.


The design process required Skywide Design to work with DePuy to understand their requirements and then with Ogle Models and Prototypes to understand the limitations of the manufacturing process. Andrew Kelly describes the early stage of the project: “Collaborating from the early stages with Ogle, we managed to tailor a design that made use of Rapid prototyping, machining and Vac moulding processes which delivered a product that was minimal in part count, simple to assemble, robust and visually appealing.”


Throughout development, the customer was updated at key stages of the development process. These were in the form of printed test models, prototype rigs and technical animations to show user interaction.


The early designs were relayed to the customer via multimedia presentations. Later in the design process some physical models were manufactured to check mechanical interaction of parts of the design.


Working closely with Skywide’s CAD models and drawings, and advising on


alterations where needed Ogle Models and Prototypes were able to anticipate and resolve problems as early as possible in the process, making the construction of the final models much easier and quicker.


Ogle Models and Prototypes had to create new systems to make the models


operate correctly, creating voids in the models to mirror the operation of real legs in order to tension the joint correctly.


Clear silicon was overmoulded onto SLS parts to create a life sized skeletal leg system displaying the first stage of alignment and measurement of the surgical equipment. The final design was a multi-functioning display stand which could transform into an interactive demonstration/ training aid.


Ogle Models & Prototypes Ltd Tel: 01462 682661 Web: www.oglemodels.com


BM has launched its PX460 plug-in measuring card enabling torque transducers to be fully integrated in its PMX industrial measuring amplifier by giving dynamic and precise measurements of frequency, pulse, speed, angle of rotation and torque. The PX460 amplifier plug-in card can acquire up to four torque transducers simultaneously with a measuring bandwidth of up to 6 kHz. In addition to torque, encoder signals of up to 2 MHz can be acquired with absolute precision in challenging industrial environments. Real time Ethernet fieldbuses such as Profinet, Ethercat or Industrial Ethernet ensure reliable integration of machine and plant control systems. The PMX measuring amplifier features Advanced Plug & Measure technology and TEDS that


Latest industrial amplifier H


automatically recognises connected transducers. This removes the need to manually enter complex settings minimising delays in actually undertaking measurement tasks. The card helps users reduce time delays while giving greater system stability and avoiding unnecessary errors.


HBM United Kingdom Ltd Tel: 020 8515 6100 Web: www.hbm.com enter 813


HBM releases upgraded digital charge amplifier H


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BM has released an improved version of its CMD600-P digital charge amplifier that now features IP65 degree of protection facilitating its use in challenging industrial environments as well as in laboratory applications. The CMD600-P digital charge amplifier also features an extremely compact design, high function density and can be positioned directly at the measuring point to measure forces or torques in extremely tough and often dirty environments. The latest design incorporates secure sealing of unused connections with protective caps so that external influences are reduced to a minimum. The digital inputs/outputs and fast Ethernet interface enables users to easily parameterize the device and monitor it during operation. The CMD600-P also features integrated peak value detection and limit value monitoring functions enabling control functions to be distributed across decentralized devices relieving pressure on the central control unit.


HBM United Kingdom Ltd Tel: 020 8515 6100 Web: www.hbm.com / DESIGNSOLUTIONS enter 814


FDA-approved gasket rings


BM is now able to supply a selection of gasket rings, such as O-rings, made of NBR gasket material that meet the highest hygiene requirements to complement its PW27 platform load cell. The gaskets have excellent cold flexibility and very good resistance against contamination by grease and oil.


In addition HBM also supplies EPDM gaskets that can be used under high application and cleaning temperatures and where acids or alkalis are used for cleaning. The heads of fastening screws can also be protected against potential contamination with gaskets designed with an external sealing bead made of EPDM elastomer.


HBM’s PW27 is the world’s first platform load cell supplied with an EHEDG certificate that acknowledges its ability to provide optimal hygiene safety in the food sector with high weighing accuracy.


HBM United Kingdom Ltd Tel: 020 8515 6100 Web: www.hbm.com


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